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Item 2C: Adoption of Resolution Amending MWMC Regional Wastewater SDC Methodology
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Item 2C: Adoption of Resolution Amending MWMC Regional Wastewater SDC Methodology
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6/9/2010 12:32:03 PM
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11/20/2009 10:33:55 AM
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Agenda Item Summary
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11/23/2009
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<br />The projected 2025 average load is determined as follows: <br />Projected 2025 BOD = (0.185 x 297,585 x 1.3) + 2,402 = 74,000 mgd (actual calculated value of <br />73,971 lbs/day rounded to the nearest hundred pounds) <br />Where: <br />0.185 is the selected pounds per capita per day (ppcd) based on dry season <br />- <br />values from 1990 to 2002 <br />297,585 is the projected population to be served in 2025 <br />- <br />1.3 is the selected peaking to convert average dry season load to DSMM load <br />- <br />(based on 1990 to 2002 data) <br />2,402 is the projected industrial flow in lbs/day (it has been assumed that the <br />- <br />industrial load will remain constant over the study period) <br />The required capacity to meet the needs of growth in terms of BOD is 19,200 lbs/day <br />(74,000 – 54,800). <br />TSS <br />The methodology for TSS is identical to that of BOD. The existing capacity, although not <br />explicitly stated in the current NPDES permit, is 71,600 lbs/day, which was the value used <br />for the original WPCF design. The current loading or current required, presented in DSMM <br />terms, is 64,700 lbs/day and is determined as follows: <br />Current TSS = (0.205 x 217,737 x 1.4) + 2,224 = 64,700 lbs/day (actual calculated value of <br />64,715 lbs/day rounded to the nearest hundred pounds) <br />Where: <br />0.205 is the selected pounds per capita per day (ppcd) based on dry season <br />- <br />values from 1990 to 2002 <br />217,737 is the population served in 2002 <br />- <br />1.4 is the selected peaking to convert average dry season flow to maximum <br />- <br />month dry season flow (based on 1990 to 2002 data) <br />2,224 is the current industrial TSS load in lbs/day <br />- <br />The available capacity in terms of TSS is 6,900 lbs/day (71,600 – 64,700). <br />The projected 2025 average TSS is determined as follows: <br />Projected 2025 TSS = (0.205 * 297,585 * 1.4) + 2,224 = 87,600 mgd (actual calculated value of <br />87,631 lbs/day) rounded to the nearest hundred pounds) <br />Where: <br />0.205 is the selected pounds per capita per day (ppcd) based on dry season <br />- <br />values from 1990 to 2002 <br />297,585 is the projected population to be served in 2025 <br />- <br />Page 32 OF 39 <br /> <br /> <br />
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